ISO 27001:2022 · Technological controls
ISO 27001:2022 8.11: Data masking
ISO 27001:2022 8.11 covers Data masking. The held text names 5 evidence records for it, the first being Statement of Applicability entry for control A.8.11, showing inclusion or justified exclusion, implementation status and the risks it.... The common gap an assessor flags is Data labelled as anonymized can be re-identified by combining remaining fields.
Data masking is to be applied as directed by the access control policy, related topic policies and what the business needs, with applicable law taken into account. Purpose (stated in ISO/IEC 27002:2022): reduces exposure of sensitive data such as PII and supports legal and contractual compliance. As an Annex A reference control, it is compared with the controls determined in risk treatment (6.1.3 c) and recorded in the Statement of Applicability as included or excluded, with the justification and implementation status (6.1.3 d); implementation guidance is ISO/IEC 27002:2022 8.11.
What evidence supports 8.11?
- Annex A technological controlStatement of Applicability entry for control A.8.11, showing inclusion or justified exclusion, implementation status and the risks it treats
- Annex A technological controlPolicy or standard specifying where masking, pseudonymization or anonymization is required, based on access control policy, business needs and law
- Annex A technological controlMasking configurations in applications, databases and reports showing minimum necessary data displayed per role
- Annex A technological controlVerification or re-identification risk assessments demonstrating that anonymization or pseudonymization is adequate
- Annex A technological controlProtection and separation of pseudonymization keys or additional information
Where this requirement comes from
This is our own statement of ISO 27001:2022 8.11, read from the copy we hold (licensed complete copy) and stated in our words, not the standard verbatim. The framework as we hold it.
Common gaps an assessor flags
- Data labelled as anonymized can be re-identified by combining remaining fields
- Hashes of identifiers are unsalted and easily reversed by enumeration
- Pseudonymization keys are stored alongside the pseudonymized data
- Full production data is visible to all users of support and reporting tools
How it maps to SOC 2
- C1.1 high Data masking protects confidential information during processing and display.
A link is a topical overlap with a confidence and a reason. It does not establish that meeting one requirement satisfies the other, and it is not certification.